I haven't looked closely, but I suspect this is due to the way Win32::Console::ANSI is implemented:

It installs a hook into kernel32.dll for the WriteFile() API and intercepts any bytes written to a console handle to check for ANSI escape sequences. It seems plausible that this heavy-handed method run afoul of improved security mechanisms in Vista.

You should file a bug report so that the module author can investigate if there is a fix or workaround for this problem.

In reply to Re: Win32::Console::ANSI Not Working in Windows Vista by jand
in thread Win32::Console::ANSI Not Working in Windows Vista by roho

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